The chances of getting winning combinations. 40,000:1 is a chance of getting a Royal Flush. Only one of 10,000 combinations can be a Straight Flush. The chance of getting Four of a Kind is 423:1. Only one of 86 combinations can be a Full House. Only one of 93 combinations can be a Flush. 85:1 is a chance of getting a Straight. The chance of getting Three of a Kind is 13:1. The chance of getting Two Pairs is 8:1. Only one of 5 combinations can be a High Pair. Online Poker Game Royal Flush.